/**
* [IN] alert_position - the position of the alert
* [IN] alert_location_info - The old location_info of the alert. Will be updated if necessary
* [OUT] pNew_Info - the location_info of this alert, to be calculated.
* returns TRUE iff successful in finding relevant location info for this alert
* - D.F.
*/
BOOL get_alert_location_info(const RoadMapPosition *alert_position,roadmap_alerter_location_info *pNew_Info,
roadmap_alerter_location_info *alert_location_info){
int alert_square_time_stamp;
int layers_count;
int count;
int layers[128];
RoadMapNeighbour neighbours;
int square;
int context_save_zoom;
RoadMapPosition context_save_pos;
if (alert_location_info){
// check if this alert was tagged as invalid in the past - Could locate a street next to it, eventhough
// its tile already exists.
if (alert_location_info->square_id == ALERTER_SQUARE_ID_INVALID)
return FALSE;
// if alert info is already initialized and has an up to date timestamp, use its info.
if(alert_location_info->square_id!=ALERTER_SQUARE_ID_UNINITIALIZED){
alert_square_time_stamp = roadmap_square_version(alert_location_info->square_id);
if(alert_square_time_stamp==alert_location_info->time_stamp){
pNew_Info->line_id = alert_location_info->line_id;
pNew_Info->square_id = alert_location_info->square_id;
pNew_Info->time_stamp = alert_location_info->time_stamp;
return TRUE;
}
}
}
// did not return so far - so no cached valid location info was found, need to cacluate it.
layers_count = roadmap_layer_all_roads (layers, 128);
if (layers_count > 0) {
square = roadmap_tile_get_id_from_position(0,alert_position);
if(!roadmap_square_set_current(square)){
return FALSE; // do no have this alert's tile, return FALSE;
}
roadmap_math_get_context(&context_save_pos, &context_save_zoom);
roadmap_math_set_context((RoadMapPosition *)alert_position, 20);
count = roadmap_street_get_closest(alert_position, 0, layers, layers_count, 1, &neighbours, 1);
roadmap_math_set_context(&context_save_pos, context_save_zoom);
if(count>0&&neighbours.distance <= MAX_DISTANCE_FROM_ROAD){
// found valid information
pNew_Info->line_id = neighbours.line.line_id;
pNew_Info->square_id = neighbours.line.square;
pNew_Info->time_stamp = roadmap_square_version(pNew_Info->square_id);
}else{
// We have the alert's tile, yet still we could not locate it satisfactorily on
// a street. Tag this alert so it will not be checked in the future.
if(alert_location_info){
alert_location_info->square_id = ALERTER_SQUARE_ID_INVALID;
}
return FALSE;
}
}
if(alert_location_info){ // update the information of the alert, for future calls.
alert_location_info->line_id = pNew_Info->line_id;
alert_location_info->square_id = pNew_Info->square_id;
alert_location_info->time_stamp = pNew_Info->time_stamp;
}
return TRUE;
}
/**
* [IN] alert_position - the position of the alert
* [IN] alert_location_info - The old location_info of the alert. Will be updated if necessary
* [OUT] pNew_Info - the location_info of this alert, to be calculated.
* returns TRUE iff successful in finding relevant location info for this alert
* - D.F.
*/
BOOL get_alert_location_info(const RoadMapPosition *alert_position, int alert_streering, roadmap_alerter_location_info *pNew_Info,
roadmap_alerter_location_info *alert_location_info){
int alert_square_time_stamp;
int layers_count;
int count;
int layers[128];
RoadMapNeighbour neighbours[2];
int square;
zoom_t context_save_zoom;
RoadMapPosition context_save_pos;
if (alert_location_info){
// check if this alert was tagged as invalid in the past - Could locate a street next to it, eventhough
// its tile already exists.
if (alert_location_info->square_id == ALERTER_SQUARE_ID_INVALID)
return FALSE;
// if alert info is already initialized and has an up to date timestamp, use its info.
if(alert_location_info->square_id!=ALERTER_SQUARE_ID_UNINITIALIZED){
alert_square_time_stamp = roadmap_square_version(alert_location_info->square_id);
if(alert_square_time_stamp==alert_location_info->time_stamp){
pNew_Info->line_id = alert_location_info->line_id;
pNew_Info->square_id = alert_location_info->square_id;
pNew_Info->time_stamp = alert_location_info->time_stamp;
return TRUE;
}
}
}
// did not return so far - so no cached valid location info was found, need to cacluate it.
layers_count = roadmap_layer_all_roads (layers, 128);
if (layers_count > 0) {
square = roadmap_tile_get_id_from_position(0,alert_position);
if(!roadmap_square_set_current(square)){
return FALSE; // do no have this alert's tile, return FALSE;
}
roadmap_math_get_context(&context_save_pos, &context_save_zoom);
roadmap_math_set_context((RoadMapPosition *)alert_position, 2);
count = roadmap_street_get_closest(alert_position, 0, layers, layers_count, 1, &neighbours[0], 2);
roadmap_math_set_context(&context_save_pos, context_save_zoom);
if(count>0&&neighbours[0].distance <= MAX_DISTANCE_FROM_ROAD){
if (count > 1){
int direction;
roadmap_square_set_current(neighbours[0].line.line_id);
direction = roadmap_line_route_get_direction (neighbours[0].line.line_id, ROUTE_CAR_ALLOWED);
if (direction == ROUTE_DIRECTION_WITH_LINE || direction == ROUTE_DIRECTION_AGAINST_LINE){
int line_azymuth;
int delta;
if (direction == ROUTE_DIRECTION_WITH_LINE)
line_azymuth = roadmap_math_azymuth (&neighbours[0].from, &neighbours[0].to);
else
line_azymuth = roadmap_math_azymuth (&neighbours[0].to, &neighbours[0].from);
delta = azymuth_delta(line_azymuth, alert_streering);
if (delta > AZYMUTH_DELTA || delta < (0-AZYMUTH_DELTA)) {
pNew_Info->line_id = neighbours[1].line.line_id;
pNew_Info->square_id = neighbours[1].line.square;
pNew_Info->time_stamp = roadmap_square_version(pNew_Info->square_id);
}
else{
pNew_Info->line_id = neighbours[0].line.line_id;
pNew_Info->square_id = neighbours[0].line.square;
pNew_Info->time_stamp = roadmap_square_version(pNew_Info->square_id);
}
}
else{
pNew_Info->line_id = neighbours[0].line.line_id;
pNew_Info->square_id = neighbours[0].line.square;
pNew_Info->time_stamp = roadmap_square_version(pNew_Info->square_id);
}
}
else{
// found valid information
pNew_Info->line_id = neighbours[0].line.line_id;
pNew_Info->square_id = neighbours[0].line.square;
pNew_Info->time_stamp = roadmap_square_version(pNew_Info->square_id);
}
}else{
// We have the alert's tile, yet still we could not locate it satisfactorily on
// a street. Tag this alert so it will not be checked in the future.
if(alert_location_info){
alert_location_info->square_id = ALERTER_SQUARE_ID_INVALID;
}
return FALSE;
}
}
if(alert_location_info){ // update the information of the alert, for future calls.
alert_location_info->line_id = pNew_Info->line_id;
alert_location_info->square_id = pNew_Info->square_id;
alert_location_info->time_stamp = pNew_Info->time_stamp;
}
return TRUE;
}
